Re: [Denemo-devel] hum on the mic input

From:

Nils Gey

Subject:

Re: [Denemo-devel] hum on the mic input

Date:

Fri, 12 Sep 2008 13:51:53 +0200

On Fri, 12 Sep 2008 12:25:27 +0100
Richard Shann <address@hidden> wrote:
> On Fri, 2008-09-12 at 12:01 +0200, Nils Gey wrote:
> > > Another route I would like to explore is direct midi input (the small
> > > keyboard I have Yamaha SHS-10 has a midi out), but the only devices I
> > > see are midi to usb, and have windows drivers...
> >
> > I'm not sure what you really mean but I got it as Midi-In for Denemo? I
> > think thats the same work as midi out ergo ALSA/JACK.
> Yes, that is what I would expect, but I am at the stage before that - I
> have no port on my computer labelled midi-in, so I can't plug this
> Yamaha keyboard in. So I have no live midi input signal to work with.
For testing you could just use a virtual midi keyboard. There are plenty in
Linux avaible.
Denemo needs an ALSA or JACK Midi-in port (and off course Midi-out). Anything
else is done outside of Denemo, especially the routing and connecting.
For real hardware-midi you need a proper soundcard. Which one do you have? The
"standard" PCI card is the M-Audio Delta Audiophile 2469 which is ok for
professional audio recording and off course Midi for a low price. There are a
lot of other pci, usb or firewire devices avaible.
> I have looked on the internet for information on getting physical midi
> signals into a computer running Linux but mostly what I see seems very
> old, saying that soundcards are (were?) midi capable but just lacked a
> little bit of circuitry to actually connect the midi out of equipment to
> them. And I see midi-usb devices for sale, but they only mention
> windows.
> Richard
You seem to be a lot outdated or not experienced with audio-linux. Since I
don't know what you do outside of Denemo I can only guess. However, the status
is:
Many PCI, Firewire and USB devices work just fine with Linux (while this is
exactly the order of what-to-prefer when you need low latency and low cpu
usage). Off course the most hardware-seller don't mention linux but ALSA can
handle many PCI and USB devices while FFADO/Freebob is for the Firewire
devices. There are acutally lots of websites and more discussions in mailing
lists what to buy so I think this is not the right place for this. I mentioned
the M-Audio 2469 pci card which is just fine if you just need a "pro" card but
don't record much audio.
So connecting a midi-instrument (keyboard) to Linux is absolutly no problem.
Like I said, for developing real-time midi or even note-for-note midi in Denemo
a virtual keyboard should be enough since it doesn't matter if its real or
virtual as long its midi.
Nils